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dc.contributor.authorAlmora Rodríguez, Osbel
dc.contributor.authorZarazua, Isaac
dc.contributor.authorMas Marzá, Elena
dc.contributor.authorMora-Sero, Ivan
dc.contributor.authorBisquert, Juan
dc.contributor.authorGarcia-Belmonte, Germà
dc.identifier.citationALMORA, Osbel, et al. Capacitive dark currents, hysteresis, and electrode polarization in lead halide perovskite solar cells. The journal of physical chemistry letters, 2015, vol. 6, no 9, p. 1645-1652.ca_CA
dc.description.abstractDespite spectacular advances in conversion efficiency of perovskite solar cell many aspects of its operating modes are still poorly understood. Capacitance constitutes a key parameter to explore which mechanisms control particular functioning and undesired effects as current hysteresis. Analyzing capacitive responses allows addressing not only the nature of charge distribution in the device but also the kinetics of the charging processes and how they alter the solar cell current. Two main polarization processes are identified. Dielectric properties of the microscopic dipolar units through the orthorhombic-to-tetragonal phase transition account for the measured intermediate frequency capacitance. Electrode polarization caused by interfacial effects, presumably related to kinetically slow ions piled up in the vicinity of the outer interfaces, consistently explain the reported excess capacitance values at low frequencies. In addition, current–voltage curves and capacitive responses of perovskite-based solar cells are connected. The observed hysteretic effect in the dark current originates from the slow capacitive mechanisms.ca_CA
dc.description.sponsorShipFinancial support by MINECO of Spain (project MAT2013-47192-C3-1-R), and Generalitat Valenciana (project ISIC/2012/008 Institute of Nan otechnologies for Clean Energies). E.M.-M. thanks the Ramo n y Cajal program, and I. Z. thanks CONACYT for a postdoctoral fellow. SCIC services at UJI are also acknowledged.ca_CA
dc.format.extent7 p.ca_CA
dc.publisherAmerican Chemical Societyca_CA
dc.relation.isPartOfJ. Phys. Chem. Lett., 2015, 6 (9)ca_CA
dc.rightsCopyright © 2015 American Chemical Societyca_CA
dc.subjectlead halide perovskitesca_CA
dc.subjectelectrode polarizationca_CA
dc.titleCapacitive dark currents, hysteresis, and electrode polarization in lead halide perovskite solar cellsca_CA

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